I remember mine very well. He told me that your first boss is crucial in determining your career success. And as true as his words were, it’s not just the first boss that’s crucial.

It’s every single one of them.

Over my relatively short eight-year career, I’ve been blessed with some amazing people to report to. All of them have taught me invaluable career lessons.

Here are five of the best ones. 5 career lessons I’ve learned from 5 of my most memorable bosses:

1. THE GENIUS

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My fifth boss was an Australian.

He was also a genius. An engineer and tinkerer—like a mini-version of Tony Stark. He could help you fix complex engineering problems without even looking away from his computer screen. Just by nonchalantly throwing verbal suggestions at you.

He often sent me away from home for weeks at a time, to be involved in an overseas project I had totally no experience in. He expected me to figure things out. Once, when I asked questions without first doing my homework, he commented, “Sometimes I think you must have had a very sheltered childhood. Figure it out yourself.”

While that project never became very successful commercially, it was a great character-building process for me.

My fifth boss taught me that in life, you learn things quickly by plunging straight into them—not by peering over someone’s shoulder taking notes; real world experience beats theoretical knowledge any day; that the hallmark of the Malaysian education system: memorisation without understanding, is useless.

And not to shy away from setbacks, but to use them as learning tools to get better.

2. THE DEVOTED

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My seventh boss was a Malaysian Chinese.

He was the most passionate and dedicated person I’ve ever met in the corporate world. He took his job veryseriously.

He would sometimes reply emails within a few minutes despite that it was three* in the morning (don’t ask me why I was writing emails to him at 3am). In fact, I don’t recall him ever not replying a single email I sent him. And this was a guy who probably had at least a hundred emails a day to attend to.

I would eventually take his position and understand why he was always so stressed. And also get the hundred emails a day to read.

He taught me how dedication to your work is necessary, if you want to succeed. And how it can also break your heart and drive you crazy—especially if you work with people who aren’t as serious about work as you are.

3. THE HIGH-FLIER

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My sixth boss was an American. He was a director in the company by his mid-thirties.

He was also the one who gave me my first promotion.

I once asked him what the secret to his success was. First, he told me had a great mentor. Then, he explained how he always listened extremely carefully to his superiors. And every single thing that they asked for, he made sure he delivered.

It made me think about how we often like to “forget” things that our bosses ask us for. Especially things that we’re reluctant to do. Well guess what, they may forget about those “little” things—but if you deliver, your bosses will always remember you.

My sixth boss taught me that age is no barrier to success. How respect and authority comes from competence, not just years of experience. That mentors are incredibly valuable. And that listening is perhaps the most important skill of all.

4. THE UNCONVENTIONAL

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My third boss was a Malaysian Malay. The first time I met him, I thought he wasn’t very intelligent. It didn’t help that he made me do all the tedious paperwork.

He’s also the least handsome guy on this list.

Some colleagues thought of him as an ass-kissing, attention-seeking, lying manipulator. But he had a way of getting improbable things approved by higher management. It helped that he seemed to have amazing self-confidence and was a great storyteller.

One time, the resident office bully spread word that he wanted to pick a fight with my second boss. By this time, we had become close—so I laughed it off and did what all weak men do: I made fun of the office bully behind his back.

But my third boss was having none of that. He went straight up to the bully and asked him gently:

“I heard you may have something against me. Shall we talk about it?”

The bully replied, “No, nothing,” and backed off like the coward he was.

Today, my third boss is an entrepreneur, established author, and on his way to becoming a local celebrity.

He taught me that boldness, drive and ambition beats natural intelligence and appearance. That in chasing your goals, you may have to defy societal expectations and conventions. That it will often make people uncomfortable, because it crosses the “safe” mental barriers they put around themselves.

And that’s OK.

5. THE NOBLE

My eighth boss was a Scotsman. He travelled over to this part of the world to further progress his career.

And progress it did. At one point of his career, he was getting promoted to more important roles every few months.

But he was also a genuinely nice person. A total opposite of the stereotype that corporate ladder climbers are scheming, backstabbing bastards. When he speaks to you, you’ll realise he generally cares for you as a person, and wants to help you develop your career.

He taught me that you could be a good boss by caring for people, and that is how loyalty is built. That making money for the company should co-exist with treating your employees well. And even if you have to make difficult, heartbreaking decisions—it can be done respectfully and honourably.

When he left, it was a quiet departure. Without any grand farewells, announcements or emotional emails. In fact, he slipped away just as quietly as the day when he first arrived.

And with that, my eighth boss taught me one final lesson:

You don’t have to be loud to make an impact in people’s lives.

What are your favorite boss stories? Comment below, I would love to hear from you!

*Dedication is important. But that doesn’t mean you have to be replying emails at 3am every morning. There are more efficient ways of doing that.